Id say pop all the valves out and replace valve stem seals as a must do and while the valves are out as such check for any play in the valve guides, as found play above spec in mine when i reconditioned the cylinder head and had them upgraded "with the valve back in the head push the stem so the valve comes out a few cm and see if there is any sizeways movement" id also recomend as a minimum to lap all the valves into there seats as exhaust valves tend to burn there seats, id also check camshaft shell bearings for any signs of wear and the camshaft lobes , but saying that any garage whos any good would check these sort of things anyway ...